GCN Circular 26429
S. Brennan (University College Dublin), T. Killestein (Warwick), M. Fraser (UCD), P. Jonker (SRON/Radboud University), K. Maguire (TCD), M. Perez Torres (IAC), report on behalf of the GW@WHT collaboration: We obtained an optical spectrum of a number of transients discovered by ZTF (Andreoni et al. GCN 26424) within the localization region of S191213g (LVC, GCN #26402) All spectra were obtained on the night of 2019 Dec 14 using the ACAM instrument mounted on the William Herschel Telescope located on the Roque de Los Muchachos Observatory, La Palma, Spain. AT2019wnn / ZTF19acymcna shows strong Halpha emission at z=0.2, which together with its location in the nucleus of its host galaxy is consistent with an AGN outburst. AT2019wni / ZTF19acymcwv is a Type Ia supernova around +10d from maximum light, at a redshift z=0.09.